Selected nitrite plus nitrate concentration data from wells in the National Water-Quality Assessment (NAWQA) Program in the eastern Iowa study unit survey.
Data frame with 30 rows and 12 columns
|su_code||character||Study unit code|
|site_no||character||USGS station number|
|C1sample_dt||Date||Cycle 1 sample date|
|C1sample_tm||character||Cycle 1 sample time|
|C1time_zone||character||Cycle 1 time zone datum|
|C1Nitrate.rmk||character||Cycle 1 remark code for nitrite plus nitrate concentration|
|C1Nitrate||numeric||Cycle 1 nitrite plus nitrate concentration|
|C2sample_dt||Date||Cycle 2 sample date|
|C2sample_tm||character||Cycle 2 sample time|
|C2time_zone||character||Cycle 2 time zone datum|
|C2Nitrate.rmk||character||Cycle 2 remark code for nitrite plus nitrate concentration|
|C2Nitrate||numeric||Cycle 2 nitrite plus nitrate concentration|
concentrations are in milligrams per liter as nitrogen.
Data retrieved from NWISWeb
(http://nwis.waterdata.usgs.gov/ia/nwis/qw) on 2012-06-18. The data
were rearranged and columns renamed to create matching data from each well.
These data represent the nitrite plus nitrate concentration in a survey in
eastern Iowa. The cycle 1 samples were collected during the summer of 1998,
and the cycle 2 samples were collected during the summer of 2007.
The description of the study unit and the cycle 1 data are described in Sadorf and Linart (2000).
Sadorf, E.M, and Linart, S.M., 2000, Ground-water quality in alluvial aquifers in the eastern Iowa basins, Iowa and Minnesota: U.S. Geological Survey Water-Resources Investigations Report 00-4106, 46 p.
1 2 3 4 5 6 7
data(EasternIowaNO3) # Show the change from cycle 1 to 2, ignoring censoring par(mar=c(5.1, 12.1, 1.1, 1.1)) plot(EasternIowaNO3$C1Nitrate, seq(nrow(EasternIowaNO3)), ylab="", xlab="Nitrate", yaxt='n', xlim=c(0, 25)) points(EasternIowaNO3$C2Nitrate, seq(nrow(EasternIowaNO3)), col='green') axis(2, at=seq(nrow(EasternIowaNO3)), labels=EasternIowaNO3$site_no, las=1)
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